nissan altima flooding and shutting off

:sarcasmsign:I have a 2003 Nissan altima 2:5 liter engine,it is flooding badly and shutting off,sometimes doesn't want to crank at all.I replaced the throttle body and it came with a new sensor on it.this is what a shop told me it was when they put it on a computer,after replacing it nothing changed.I did the on off method as well and no change,please help anyone know what this is